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Gas – a state of matter in which a substance completely fills the region in which it is contained; has very low density and viscosity; can expand and contract greatly in response to changes in temperature and pressure; and easily diffuses into other gases e.g., CO, CO2, HCN, NH4, SO2, H2S, N2O, O3, Formaldehyde, phosgene, arsine, vinyl chloride etc

Vapour – the gaseous state or form of a substance which is normally in the liquid or solid state at room temperature and pressure. The liquid or solid may be reduced to the vapor by the action of heat. A vapor can be liquefied by a suitable increase in pressure e.g., toluene, xylene, alcohol, C2S, benzene, carbon tetrachloride etc